Un carrello di massa 1,50 kg, urta con velocità v una molla, di costante elastica 750 N/m, e la comprime di
6,0 cm.
Calcola la velocità iniziale del carrello.

gas and liquid

does anyone know or what?

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.